example script for https://github.com/aws/aws-sdk-ruby/issues/2482

accesspoint.rb

#!/usr/bin/env ruby

require 'aws-sdk'

region            = 
access_key_id     = 
secret_access_key = 

account_id  = 
accesspoint = 

key     = 'foo'
new_key = 'bar'

bucket_arn = "arn:aws:s3:#{region}:#{account_id}:accesspoint/#{accesspoint}"

client = Aws::S3::Client.new(
  region:            region,
  access_key_id:     access_key_id,
  secret_access_key: secret_access_key
)

object = Aws::S3::Object.new(bucket_arn, key, client: client)
puts object.exists?
object.move_to(bucket: bucket_arn, key: new_key)